GIS中的VFT过电压分析

Analysis of very fast transient overvoltage in GIS

分析了操作气体绝缘变电站（ＧＩＳ）隔离开关所产生的特快速瞬变过程（ＶＦＴ）过电压形成的机理；ＶＦＴ的分类、特性及其对ＧＩＳ本身和电力系统高压设备可能带来的危害。陈述了ＧＩＳ中绝缘在ＶＦＴ过电压作用下的性能并初步分析了ＶＦＴ过电压对绝缘造成危害的可能原因。作者认为随着我国高压ＧＩＳ的迅速发展，应对ＶＦＴ过电压高度重视，并加强对ＧＩＳ运行中的在线监测以提高ＧＩＳ运行的可靠性。

This paper presents the analysis of very fast transients overvoltages in GIS generated by disconnectors operation. The origin, mechanisms, classification and characteristics of VFT and details of VFT overyoltage effects on various GIS components and high voltage equipment in power system are given. The need for further research on VFT phenomena and the need of increasing use of condition monitoring technique leading to further improvement in reliability of GIS are also proposed.